Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd4417eb1679f25…

MALICIOUS

PDF

78.7 KB Created: 2021-02-28 13:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d80559c16a2401f2a0baabffeb18073a SHA-1: 14257d88152efdece1961d543c3fc719b4b4c7d0 SHA-256: 5bd4417eb1679f2514127c4de39d76a92f81fbe444ee094cd8ec641b74c615e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. It contains multiple embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware download sites. The PDF structure and embedded URIs are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/wb?keyword=do%20holmes%20air%20purifiers%20work PDF link annotation
    • http://nabavawuzafurur.mygamesonline.org/57214522578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470408/normal_6031308a03b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_5fe7d793756fd.pdfIn PDF document text
    • http://glossywp.online/gabadasareterimexexu7qjkt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461498/normal_600f5c671df83.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/6457393080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_5fd632c5bc69e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_601ee6f044424.pdfIn PDF document text
    • http://fastcreditreport.info/xabixidazidusinujopozi7qdc9.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/51073836125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_60388d8c8938c.pdfIn PDF document text
    • http://trokot-roznica.xyz/tinakobitamegijrstrr.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/square-d_40-60_water_pump_pressure_switch_9013fsg2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378856/normal_60098133db57d.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/nokia_lumia_521_t_mobile_unlock_code_free.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/dell_b1160_printer_cartridge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_5fcb1064843f8.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/56397290157.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://faxiruvud.myartsonline.com/22901333301.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 4992 bytes
SHA-256: 4ad03edd3a050dbcb71edc33a018b93189ed34f744d28251de1fcbb2cd91cdbf
font_01_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 10804 bytes
SHA-256: debee3f7ad55e9bdf2905460713e22d2a8b0ee965854948f4b565b43cfb64da4
font_02_sfnt_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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